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用于示波器振幅控制的最常见电路之一是软限幅电路(图1a)。当输出电压VOUT(t)低时,二极管D1和D2关断。因此,所有输入电流VIN(t)/R1都流经反馈电阻R2,而输出电压为:
One of the most common circuits for oscilloscope amplitude control is a soft-limit circuit (Figure 1a). When the output voltage VOUT (t) is low, the diodes D1 and D2 turn off. Therefore, all input current VIN (t) / R1 flows through the feedback resistor R2 and the output voltage is: